package org.ricks.asm;

public abstract class RecordComponentVisitor {
    /**
     * The ASM API version implemented by this visitor. The value of this field must be one of {@link
     * Opcodes#ASM8} or {@link Opcodes#ASM9}.
     */
    protected final int api;

    /**
     * The record visitor to which this visitor must delegate method calls. May be {@literal null}.
     */
    /*package-private*/ RecordComponentVisitor delegate;

    /**
     * Constructs a new {@link RecordComponentVisitor}.
     *
     * @param api the ASM API version implemented by this visitor. Must be one of {@link Opcodes#ASM8}
     *     or {@link Opcodes#ASM9}.
     */
    protected RecordComponentVisitor(final int api) {
        this(api, null);
    }

    /**
     * Constructs a new {@link RecordComponentVisitor}.
     *
     * @param api the ASM API version implemented by this visitor. Must be {@link Opcodes#ASM8}.
     * @param recordComponentVisitor the record component visitor to which this visitor must delegate
     *     method calls. May be null.
     */
    protected RecordComponentVisitor(
            final int api, final RecordComponentVisitor recordComponentVisitor) {
        if (api != Opcodes.ASM9
                && api != Opcodes.ASM8
                && api != Opcodes.ASM7
                && api != Opcodes.ASM6
                && api != Opcodes.ASM5
                && api != Opcodes.ASM4
                && api != Opcodes.ASM10_EXPERIMENTAL) {
            throw new IllegalArgumentException("Unsupported api " + api);
        }
        if (api == Opcodes.ASM10_EXPERIMENTAL) {
            Constants.checkAsmExperimental(this);
        }
        this.api = api;
        this.delegate = recordComponentVisitor;
    }

    /**
     * The record visitor to which this visitor must delegate method calls. May be {@literal null}.
     *
     * @return the record visitor to which this visitor must delegate method calls or {@literal null}.
     */
    public RecordComponentVisitor getDelegate() {
        return delegate;
    }

    /**
     * Visits an annotation of the record component.
     *
     * @param descriptor the class descriptor of the annotation class.
     * @param visible {@literal true} if the annotation is visible at runtime.
     * @return a visitor to visit the annotation values, or {@literal null} if this visitor is not
     *     interested in visiting this annotation.
     */
    public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible) {
        if (delegate != null) {
            return delegate.visitAnnotation(descriptor, visible);
        }
        return null;
    }

    /**
     * Visits an annotation on a type in the record component signature.
     *
     * @param typeRef a reference to the annotated type. The sort of this type reference must be
     * @param typePath the path to the annotated type argument, wildcard bound, array element type, or
     *     static inner type within 'typeRef'. May be {@literal null} if the annotation targets
     *     'typeRef' as a whole.
     * @param descriptor the class descriptor of the annotation class.
     * @param visible {@literal true} if the annotation is visible at runtime.
     * @return a visitor to visit the annotation values, or {@literal null} if this visitor is not
     *     interested in visiting this annotation.
     */
    public AnnotationVisitor visitTypeAnnotation(
            final int typeRef, final TypePath typePath, final String descriptor, final boolean visible) {
        if (delegate != null) {
            return delegate.visitTypeAnnotation(typeRef, typePath, descriptor, visible);
        }
        return null;
    }

    /**
     * Visits a non standard attribute of the record component.
     *
     * @param attribute an attribute.
     */
    public void visitAttribute(final Attribute attribute) {
        if (delegate != null) {
            delegate.visitAttribute(attribute);
        }
    }

    /**
     * Visits the end of the record component. This method, which is the last one to be called, is
     * used to inform the visitor that everything have been visited.
     */
    public void visitEnd() {
        if (delegate != null) {
            delegate.visitEnd();
        }
    }
}
